As I have said before, an indemnity policy purchased during a house sale to "cover" some defect is increasingly popular, especially amongst lazy lawyers. The policy does not cure the defect, it only provides monetary compensation in the event of a subsequent problem.
Historically they were used to cover problems with the title to the property, whereby some 3rd party might challenge the title. Thereafter the insurance companies offered them to cover situations where alterations had been done without Building Warrant or other consents. In the main, they are pretty useless. However, as above, the purchaser/his solicitor is under no obligation to accept such a policy, so it follows that even if the current purchaser does go ahead, a subsequent purchaser from him may not. Thus, they are a last resort, in cases where the risk is minuscule. A good and proper title needs no fortification.
Many lawyers are using these policies as a simple way to make problems go away. That is poor practice. Also, if a lender is involved, they have to be consulted over an indemnity policy, and often they will fire it back to the lawyer and say they will follow his advice. Neatly, that means that the lawyer himself, as well as the insurer, is liable in a claim if the lender loses out...and that is where the lawyer's Professional Indemnity insurance kicks in.
As the condition of an electrical installation is not (yet) a factor in conveyancing transactions here in Scotland, the (very) few insurers who offer indemnity for house purchase matters have not yet had to concoct another load of convoluted drivel to make it look as if they are covering the "defect"even if in reality they are not. This is a good thing. These policies were originally known as Defective Title Indemnity policies, and that is what they should remain-policies that offer some financial compensation for a defect in title to the property, not for some dodgy wiring. Title defects are usually cured by passage of time, dodgy wiring is not.